JPH04276195A - Oiling mechanism for sealed type compressor - Google Patents

Abstract

PURPOSE:To eliminate the shortage of oil supply by installing a valve element made of shape memory alloy on a divider and closing the valve element by a spring piece and storing the lubricating oil on the upper surface, when the temperature is below a prescribed value. CONSTITUTION:A valve element 63 made of shape memory alloy and opens at a prescribed temperature is installed in a divider 6, and set so as to surround the inflow hole 51 of an oil tube 5 in the case of closure. A spring piece 65 for pushing the valve body 63 in the closing direction is installed, and when the temperature is below a prescribed value, the valve element 63 is put into a closure state, and oil is stored on the upper surface of the divider 6. Even if the oil level is low on the start of a compressor, shortage of the supply of oil is not generated because of the stored oil. When temperature rises, the valve element 63 is opened to pump up lubricating oil by the divider action.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides an oil tube having an inflow hole at the tip attached to the lower end of a drive shaft having an oil supply passage, and pumping oil from the inflow hole by rotation of the drive shaft. The present invention relates to an oil supply mechanism for a hermetic compressor in which oil is supplied to each sliding contact portion from the oil supply passage.

0002

2. Description of the Related Art This type of oil supply mechanism is described, for example, in Japanese Patent Application Laid-Open No. 57-181988, and as shown in FIG. At the lower end of the oil supply passage A, an oil tube B is attached, which has an inflow hole B1 at its tip, and the inflow hole B1 faces an oil sump C at the bottom of the casing. and,
The rotation of the drive shaft K draws oil from the inflow hole B1 into the oil supply passage A, and the oil is pumped up into the oil supply passage A through a branch passage A1 extending laterally of the oil supply passage A to the bearing portion of the drive shaft K in the front head H and the cylinder. Each sliding part in S is supplied with oil.

0003

[Problems to be Solved by the Invention] However, in the above-mentioned oil supply mechanism, since the oil tube B is formed in a penetrating shape, when lubricating oil flows out from the compressor, the oil level may be lower than that of the oil tube B. If the compressor is started when the lower end of the inflow hole B1 is cut, the oil tube B cannot draw up lubricating oil from the oil sump C, so the oil supply points cannot be refueled, and the sliding contact area may seize. There were problems that arose. In addition, if forming occurs due to startup at low temperatures, foam-like lubricating oil mixed with gas refrigerant is supplied to each sliding contact part, and in this case too, there is a lack of lubricating oil in the sliding contact parts, causing the sliding parts to This caused the problem of burn-in.

The present invention has been made in view of the above problems, and its purpose is to provide sufficient lubricating oil at the time of starting the compressor even if the oil level in the oil tube runs out at the time of starting the compressor. An object of the present invention is to provide an oil supply mechanism for a hermetic compressor that can supply oil to contact parts.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes an oil tube 5 having an inflow hole 51 at its tip attached to the lower end of a drive shaft 3 having an oil supply passage 4. , an oil supply mechanism for a hermetic compressor in which oil is pumped up from the inflow hole 51 by rotation of the drive shaft 3 and supplied to the oil supply passage 4, which surrounds the inflow hole 51 and has a predetermined transformation point. A divider 6 having a plurality of shape memory alloy valve bodies 63 whose tips open radially outward at the transformation point temperature is formed in the center, and the divider 6 is connected to the oil tube. 5, and the divider 6 is provided with a spring piece 65 that urges the valve body 63 in the closing direction and closes the valve body 63 at a temperature lower than the transformation point temperature.

[0006] Furthermore, the divider 6 is connected to the inlet hole 5.
1, and a cylindrical upper part 6 that extends upward from the base 61 and tapers upward.
2, and the cylindrical upper part 62 is formed into a plurality of shape memory alloy valve bodies 63 having a predetermined transformation point temperature and whose tips open radially outward at the transformation point temperature. It is preferable to do so.

[0007]

[Function] The divider 6 allows the shape memory alloy of the divider 6 to be used even when the oil level in the oil reservoir in the sealed casing is lower than the inflow hole 51 of the oil tube 5, such as when the compressor is stopped in a low temperature state. The valve body 63 is attached to the spring piece 6.
The lubricating oil can be stored on the upper surface side of the divider 6 when the divider 6 is biased into the closed state. The lubricating oil accumulated on the upper surface side can be supplied from the oil supply passage 4 to each sliding contact part, and even if forming occurs due to the operation of the compressor, the lubricating oil is free from bubbles accumulated on the upper surface of the divider 5. Since the liquid can be supplied to each sliding contact portion, it is possible to reliably prevent each sliding contact portion from being burned. Moreover, the temperature inside the casing rises to the transformation point temperature due to the operation of the compressor.
When the oil tube 5 is immersed in the oil sump, the valve body 63 of the divider 6 opens radially outward due to the transformation of the shape memory alloy, and lubrication is carried out from the oil sump into the oil supply passage 4. Oil can be pumped up and supplied to each sliding portion, and furthermore, the valve body 63 in the open state exhibits a divider action, allowing lubricating oil to be efficiently supplied to each sliding portion.

[0008] Furthermore, the divider 6 is connected to the inflow hole 5.
1, and a cylindrical upper part 6 that extends upward from the base 61 and tapers upward.
2, and the cylindrical upper part 62 is formed on the shape memory alloy valve element 63, so that the valve element 63 formed in the cylindrical upper part 62 of the divider 6 can be formed from the cylindrical part in the axial direction. The height of the valve body 6 can be increased by the height of the shaped upper part 62.
3 is open, the effect of the divider action can be exerted more efficiently. Further, the valve body 6
3 is in the closed state, the tip of the valve body 63, which is easily deformed by the weight of lubricating oil, is at the highest position compared to the cylindrical base 61 where lubricating oil begins to accumulate, so lubricating oil is absorbed into this tip. The lubricating oil can be reliably stored on the upper surface side of the divider 6 without leaking downward from the divider 6.

[0009]

[Embodiment] FIG. 1 is a sectional view of the main part showing the lower side of a hermetic compressor equipped with the oil supply mechanism of the present invention. A compression element 2 is disposed on the side, and the compression element 2 and the motor are connected to each other.
They are interlocked and connected via a drive shaft 3.

The compression element 2 is composed of a front head 21, a rear head 22, and a cylinder 23 sandwiched between these heads 21, 22, and a roller 25 is installed in a cylinder chamber 24 of the cylinder 23. An eccentric shaft portion 31 of the drive shaft 3 is fitted into the roller 25.

The low-pressure gas refrigerant supplied from the suction port 26 to the cylinder chamber 24 flows through the eccentric shaft portion 31 of the drive shaft 3.
Due to the eccentric rotation of the cylinder, it is compressed in the cylinder chamber 24, discharged into the sealed casing 1, and then discharged to the outside from a discharge pipe (not shown) provided in the casing 1.

Further, an oil supply passage 4 extending in the axial direction is formed inside the drive shaft 3, and extends radially outward from the oil supply passage 4, and connects the drive shaft 3 and both heads 21,
22 and rollers 25, and an oil tube 5 immersed in the oil reservoir 1a of the casing 1 at the lower end of the oil supply passage 4.
Attach the inflow hole 51 to the tip of the oil tube 5.
The oil is pumped up from the inflow hole 51 by the rotation of the drive shaft 3 and transferred from the oil supply passage 4 to each of the branch passages 41.
Each sliding contact portion is supplied with oil through...

[0013] In the hermetic compressor described above, as in the embodiment shown in FIGS. It consists of a cylindrical upper part 62 that extends and tapers upward, and has a predetermined transformation point temperature, at which the tip part extends radially outward. The divider 6 is formed of a plurality of shape memory alloy valve bodies 63 that open towards the oil tube 5, and the divider 6 is installed inside the oil tube 5.
In addition, a spring piece 64a is attached that biases the valve body 63 in the closing direction and closes the valve body 63 at a temperature lower than the transformation point temperature.

Specifically, in the embodiment shown in FIGS. 2 and 3, the entire circumference of the lower end of the divider 6 is in close contact with the inner surface of the oil tube 5, and from the end in the inner radial direction A cylindrical base 61 extending obliquely upward, and this base 61
and a cylindrical upper part 62 which extends further upward in a tapered shape and closes at the tip, and the cylindrical upper part 62 has a plurality of slits 62a extending axially downward from the tip. A valve body 63 that can be opened and closed is provided.
...is formed. And each of the valve bodies 63...
When the temperature reaches a predetermined temperature or higher (for example, 40° C. or higher), the valve body 63 transforms into a state in which it opens radially outward as shown in FIG.
...is configured so that it operates. Further, on the upper side of the divider 6, a thin spring plate 64 having the same shape as the divider 6 and covering the divider 6 is laminated and attached. A spring piece 65 is formed at a position facing the valve body 6 to urge the valve body 6 in the closing direction, so that the valve body 63 is closed when the temperature becomes lower than the transformation point.

[0015] Thus, when the compressor is stopped, the shape memory alloy valve body 63 of the divider 6 is
The biasing force of the spring piece 65 allows the divider 6 to be brought into a closed state, allowing lubricating oil to be stored on the upper surface side of the divider 6. Therefore, when the compressor is started, the oil level in the oil sump 1a is low and the oil tube 5 is connected to the oil sump 1a.
The lubricating oil accumulated on the upper surface side of the divider 6 can be supplied from the oil supply passage 4 to each sliding contact portion even if the divider 6 is not immersed in water.
Also, even if forming occurs due to compressor operation,
Since the valve body 63 can be operated to the closed side until the temperature rises to the transformation point temperature, the bubble-free lubricating oil accumulated on the upper surface of the divider 5 can be supplied to each sliding contact part, and the startup This makes it possible to reliably prevent the respective sliding contact portions from being burned during the process. Moreover, when the temperature inside the casing rises to the transformation point temperature due to operation of the compressor, the oil level in the oil sump 1a rises and the oil tube 5 is immersed in the oil sump 1a. At this time, the valve body 63 of the divider 6 opens radially outward due to the transformation of the shape memory alloy, and pumps lubricating oil from the oil reservoir 1a into the oil supply passage 4 to each sliding contact portion. Moreover, the valve body 63 in the open state acts as a divider, and the lubricating oil can be efficiently supplied to each sliding portion.

[0016] Furthermore, the cylindrical upper part 6 of the divider 6
The valve body 63 formed in the cylindrical upper part 6 in the axial direction
Since the height can be increased by 2, the divider effect can be more efficiently exerted when the valve body 63 is in the open state. Furthermore, even when the valve body 63 is in the closed state, the tip of the valve body 63, which is easily deformed by the weight of lubricating oil, is at the highest position than the cylindrical base 61, where lubricating oil begins to accumulate, so that lubrication is prevented. The oil does not flow downward from this tip, and the lubricating oil can be reliably stored on the upper surface side of the divider 6.

The shape of the valve body 63 in the open state is shown in FIG.
The divider may be set in a twisted shape as shown in FIG.

Further, the divider may be formed in the shape of a disc whose outer peripheral surface is in close contact with the inner peripheral surface of the oil tube 5, as shown in FIGS. 6 and 7, and the disc-shaped divider 6A is A radial slit 66 is provided in the center, and this slit 66 forms a valve body 63A. Further, a spring plate 64A having the same shape as the divider 6A is laminated on the top of the divider 6A, and a spring piece 65A having the same shape as the valve body 63A is also formed in the center of the spring plate 64A. This is done so as to bias 63A in the direction of closing.

Also in this case, the divider 6A
As a result, lubricating oil can be stored on the upper surface side of the divider 6', so that lubricating oil can be reliably supplied to each sliding contact portion without causing a shortage of lubricating oil when starting up the compressor, and seizing can be prevented.

[0020]

As described above, the present invention surrounds the inflow hole 51 of the oil tube 5 and has a predetermined transformation point temperature, and at the transformation point temperature, the tip end extends outward in the radial direction. A divider 6 is formed with a plurality of shape memory alloy valve bodies 63 that open toward the center thereof, and the divider 6 is installed inside the oil tube 5, and the divider 6 is provided with:
Since the spring piece 65 is attached to bias the valve body 63 in the closing direction and close the valve body 63 at a temperature lower than the transformation point temperature, when the compressor is stopped, the divider 6 made of the shape memory alloy The valve body 63 is brought into a closed state by the urging force of the spring piece 65, and lubricating oil can be stored on the upper surface side of the divider 6. Therefore, even if the oil level in the oil sump 1a drops when the compressor is started and the oil tube 5 is not immersed in the oil sump 1a, the lubricating oil accumulated on the upper surface side of the divider 6 can be transferred to the oil supply passage. 4 can be supplied to each sliding contact part, and even if forming occurs due to the operation of the compressor, bubble-free lubricating oil accumulated on the upper surface of the divider 5 can be supplied to each sliding contact part. This eliminates the shortage and reliably prevents burning of each sliding contact part. Moreover, when the temperature inside the casing rises to the transformation point temperature due to operation of the compressor, the valve body 63 of the divider 6 is opened radially outward due to the transformation of the shape memory alloy, and the oil Tame 1a
The lubricating oil can be pumped up into the oil supply passage 4 and supplied to each sliding contact part, and further, the lubricating oil can be pumped up into the oil supply passage 4 and supplied to each sliding contact part.
acts as a divider, allowing lubricant to be efficiently supplied to each sliding contact area.

[0021] Furthermore, the divider 6 is connected to the inlet hole 5.
1, and a cylindrical upper part 6 that extends upward from the base 61 and tapers upward.
2, and the cylindrical upper part 62 is formed on the shape memory alloy valve element 63, so that the valve element 63 formed in the cylindrical upper part 62 of the divider 6 can be formed from the cylindrical part in the axial direction. The height of the valve body 6 can be increased by the height of the shaped upper part 62.
3 is open, the effect of the divider action can be exerted more efficiently. Further, the valve body 6
3 is in the closed state, the tip of the valve body 63, which is easily deformed by the weight of lubricating oil, is at the highest position compared to the cylindrical base 61 where lubricating oil begins to accumulate, so lubricating oil is absorbed into this tip. The lubricating oil can be reliably stored on the upper surface side of the divider 6 without leaking downward from the divider 6.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts of a hermetic compressor according to the present invention.

FIG. 2 is an enlarged sectional view of an oil tube showing an embodiment of the present invention.

FIG. 3 is a partially cutaway perspective view of the embodiment shown in FIG. 2;

FIG. 4 is a perspective view corresponding to FIG. 3 showing the valve body in the divider in an open state.

FIG. 5 is a perspective view corresponding to FIG. 4 showing another embodiment of the present invention.

FIG. 6 is a perspective view corresponding to FIG. 3 showing another embodiment of the present invention.

FIG. 7 is a perspective view corresponding to FIG. 6 showing the valve body of the divider in the embodiment shown in FIG. 6 in an open state;

FIG. 8 is a sectional view showing a conventional example.

[Explanation of symbols]

3 Drive shaft 4 Refueling passage 5 Oil tube 51 Inflow hole 6 Divider 61　Cylindrical base 62 Cylindrical upper part 63 Valve body 65 Spring piece

Claims (2)

[Claims] Claim 1: At the lower end of the drive shaft 3 having the oil supply passage 4,
An oil supply mechanism for a hermetic compressor in which an oil tube 5 having an inflow hole 51 is attached to the tip thereof, and oil is pumped up from the inflow hole 51 and supplied to the oil supply passage 4 by rotation of the drive shaft 3. A plurality of shape memory alloy valve bodies 6 surround the inflow hole 51, have a predetermined transformation point temperature, and have their tip portions open radially outward at the transformation point temperature.
3 in the center, and the divider 6 is installed inside the oil tube 5, and the valve body 63 is biased in the closing direction to the divider 6, and the divider 6 is heated to a temperature lower than the transformation point temperature. An oil supply mechanism for a hermetic compressor, which is equipped with a spring piece 65 that closes the valve body 63. 2. The divider 6 includes a cylindrical base 61 surrounding the inflow hole 51 and extending upward from the base 61, and
The cylindrical upper part 62 is formed from a cylindrical upper part 62 that tapers upwardly, and has a predetermined transformation point temperature, and at the transformation point temperature, the tip part extends radially outward. The oil supply mechanism for a hermetic compressor according to claim 1, wherein the oil supply mechanism is formed in a plurality of shape memory alloy valve bodies 63 that open.